During a blue-green deployment, users experience intermittent errors immediately after traffic is switched. What is the most probable cause?

medium📝 Analysis Q6 of 15

Microservices - CI/CD for Microservices

AThe new environment was not fully deployed before switching traffic.

BLoad balancer caching old routing rules causing some traffic to hit the previous environment.

CDatabase schema changes were not backward compatible.

DThe old environment was deleted before switching traffic.

Step-by-Step Solution

Solution:

Step 1: Identify symptoms
Intermittent errors after switching traffic usually indicate some requests still reach the old environment.
Step 2: Analyze causes
Load balancer caching or DNS propagation delays can cause some users to hit the old environment.
Step 3: Evaluate options
Load balancer caching old routing rules causing some traffic to hit the previous environment. explains the most common cause: cached routing rules in the load balancer.
Final Answer:
Load balancer caching old routing rules causing some traffic to hit the previous environment. -> Option B
Quick Check:
Check load balancer cache or DNS propagation [OK]

Quick Trick: Load balancer caching causes mixed traffic post-switch [OK]

Common Mistakes:

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